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Brett McGuire’s team found propylene oxide in Sagittarius B2, an interstellar cloud and star-forming region

Some organic molecules can exist in two seemingly identical forms that are mirror images of each other, but have different chemical properties – enantiomers. But biological molecules, such as sugars or amino acids, only exist in one chiral form on Earth. Many chemists are struggling to explain this disparity, with many believing the origins of homochirality can be found in space.

In an attempt to retrace life’s steps, Brett McGuire and colleagues at the California Institute of Technology and Harvard University, US, pointed the Parkes radio telescope, Australia, towards the centre of our solar system. The team found the chiral molecule propylene oxide in Sagittarius B2, a giant molecular cloud and star-forming region.

Although the measurement in of itself doesn’t explain homochirality, the team argue the sensitivity of such telescopes could pick up whether an enantiometric excess exists in space.